{% load cache %}
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h1>{{ ctime }}</h1>
    <h1>{{ ctime }}</h1>
    {% cache 5 c1 %}
        <h1>{{ ctime }}</h1>
    {% endcache %}
</body>
</html>